<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        table {
            border: 1px solid #000;
            text-align: center;
            width: 300px;
        }

        th, td {
            border: 1px solid #000;
        }

        h3 {
            position: relative;
        }

        span {
            position: absolute;
            left: 145px;
            top: -4px;
            width: 16px;
            height: 16px;
            color: white;
            font-size: 12px;
            text-align: center;
            border-radius: 50%;
            background-color: #e63f32;
        }
    </style>
</head>
<body>

    <div id="app">
        <h3>小黑的礼物清单🛒<span>{{ totalCount }}</span></h3>
        <table>
            <tr>
                <th>名字</th>
                <th>数量</th>
            </tr>
            <tr v-for="(item, index) in list" :key="item.id">
                <td>{{ item.name }}</td>
                <td>{{ item.num }}个</td>
            </tr>
        </table>

        <p>礼物总数：{{ totalCount }} 个</p>
    </div>
    <script src="../utils/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                // 现有的数据
                list: [
                    { id: 1, name: '篮球', num: 3 },
                    { id: 2, name: '玩具', num: 2 },
                    { id: 3, name: '铅笔', num: 5 },
                ]
            },
            computed: {
                totalCount() {
                    let total = this.list.reduce((sum, item) => sum + item.num, 0)
                    return total
                }
            }
        })
    </script>
</body>
</html>